27
27 October 1950
(midwest.social)
When the globe doesn't have the ocean ridges painted on.
Isn't there a future comic where Lucy uses Charlie Brown's head as a visual aid to explain some geographic or cartography principle?
Yep, I'll be posting it in a little over a decade:
On a related note, this is a good Peanuts search engine, used it to find that comic:
For posts about the comic Peanuts, by Charles M. Schulz